Module; Ventilation Control Module; (Vcm); System Module Option - Trane IntelliPak SCWF 20 Installation, Operation And Maintenance Manual

Summit or a third party building automation system
that supports LonTalk.
The BCI-I (BACnet) utilizes the BACnet defined MS/TP
protocol as defined in ASHRAE standard 135-2004. This
controller works in standalone mode, with Tracer SC®
or when connected to a third party building automation
system that supports BACnet.
Exhaust/Comparative Enthalpy Module
(ECEM - Optional used on units with Statitrac and/or
comparative enthalpy options)
The Exhaust/Comparative Enthalpy module receives
information from the return air humidity sensor, the
outside air humidity sensor, and the return air
temperature sensor to utilize the lowest possible
humidity level when considering economizer
operation. In addition, it receives space pressure
information which is used to maintain the space
pressure to within the setpoint control band. Refer to
Figure 36, p. 73 for humidity vs. voltage values.
Figure 36. Relative humidity vs. voltage
Figure 37. Velocity pressure transducer/solenoid
assembly
Tube from low side
of Velocity Ring
Solenoid
Tube from high side
of Transducer
Ventilation Control Module (VCM)
( ( A A v v a a i i l l a a b b l l e e o o n n l l y y w w i i t t h h T T r r a a q q ™ ™ d d a a m m p p e e r r o o p p t t i i o o n n ) )
The ventilation control module (VCM) is located in the
airside economizer section of the unit and linked to the
unit's UCM network. Using a velocity pressure
transducer/solenoid (pressure sensing ring) in the fresh
air section allows the VCM to monitor and control fresh
air entering the unit to a minimum airflow setpoint. See
SCXF-SVX01Q-EN
Tube from low side
of Transducer
Pressure
Transducer
Ventilation
Control Module
Figure 36, p. 73 for a detail view of the velocity
pressure transducer/solenoid assembly.
An optional temperature sensor can be connected to
the VCM to enable control of a field installed fresh air
preheater.
Also, a field-provided CO
the VCM to control CO reset. The reset function
2
adjusts the minimum cfm upward as the CO
concentrations increase. The maximum effective (reset)
setpoint value for fresh air entering the unit is limited
to the system's operating cfm.
minimum outside air cfm vs input voltage.
Table 42. Minimum outside air setpoint w/VCM
module and Traq™ sensing
Input Volts
Unit
SXWF 20 0.5 - 4.5 vdc
SXWF 22 0.5 - 4.5 vdc
SXWF 25 0.5 - 4.5 vdc
SXWF 29 0.5 - 4.5 vdc
SXWF 32 0.5 - 4.5 vdc
SXWF 35 0.5 - 4.5 vdc
SXWF 38 0.5 - 4.5 vdc
SXWF 42 0.5 - 4.5 vdc
SXWF 46 0.5 - 4.5 vdc
SXWF 52 0.5 - 4.5 vdc
SXWF 58 0.5 - 4.5 vdc
SXWF 65 0.5 - 4.5 vdc
SXWF 72 0.5 - 4.5 vdc
SXWF 80 0.5 - 4.5 vdc
SXRF 25 0.5 - 4.5 vdc
SXRF 29 0.5 - 4.5 vdc
SXRF 30 0.5 - 4.5 vdc
SXRF 35 0.5 - 4.5 vdc
SXRF 40 0.5 - 4.5 vdc
SXRF 50 0.5 - 4.5 vdc
SXRF 60 0.5 - 4.5 vdc
Generic Building Automation System
Module Option
Generic building automation system module (GBAS)
provides broad control capabilities for building
automation systems other than Trane's Tracer®
system. A field provided potentiometer or a 0-5 Vdc
signal can be applied to any inputs of GBAS to provide
following points:
C C o o n n t t r r o o l l s s
sensor can be connected to
2
2
Table 42, p. 73 lists the
CFM
6,325-8,500
6,325-9,350
6,500-10,625
8,700-12,325
8,700-13,600
9,100-14,875
9,880-16,150
11,200-17,859
11,960-19,550
14,250-22,100
15,080-24,650
16,900-27,625
18,700-29,800
20,800-29,800
8,700-12,325
8,700-13,600
9,100-14,875
9,880-16,150
11,960-19,550
15,080-24,650
20,800-29,800
73